What is a characteristic of the cell walls of mature plant cells?
A. Pectin
B. Cellulose
C. Glue-like polysaccharides
D. Lignin
E. A gluey matrix containing rope-like strands
Answer: D
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What feature enables the paramecium to move?
a. nucleus b. cilia c. flagella d. pseudopodia e. contractile vacuole
In fruit flies, males are determined by the presence of an X and Y chromosome; females are determined by two X chromosomes. The gene for eye color is located on the X chromosome and is absent from the Y chromosome. The allele for white eyes is recessive and the allele for red eyes is dominant. If a red-eyed male is mated with a white-eyed female, what is the probability that their male offspring will be white-eyed?
A. 100% B. 50% C. 25% D. 0%
The set of blood vessels with the slowest velocity of blood flow is
A) the arteries. B) the arterioles. C) the metarterioles. D) the capillaries. E) the veins.
Which statement is TRUE regarding the negative feedback homeostatic mechanism, which occurs during temperature regulation?
A) The only receptors for temperature exist in the skin B) The skin acts like a radiator, losing heat to the environment C) At normal body temperature, the temperature control center is extremely active D) Increased activity in the control center targets skeletal muscle in the extremities